Fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan

ABSTRACT

The invention relates to a fast-positioning device for assembling b lad e brackets to a motor housing of a ceiling fan. The motor housing has its bottom provided with at least a positioning plate respectively projected downward at plural locations equidistantly spaced apart around its circumference. Each of the positioning plates has a long side arranged around the circumference of the motor housing. Each blade bracket has a connecting portion for connecting with the motor housing. The connecting portion has at least a plugging groove bored vertically to correspond to and be inserted by the positioning plate, so as to keep the blade bracket quickly positioned under the motor housing and engaging positioning locations of the blade brackets and the motor housing exactly facing to each other.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a ceiling fan, particularly to one having a fast-positioning device for assembling blade brackets to its motor housing.

2. Description of the Prior Art

Commonly, screws and threaded holes are the typical devices used to keep blade brackets assembled with a conventional ceiling fan motor. As disclosed in U.S. Pat. No. 6,352,411, “QUICK INSTALL BLADE ARMS FOR CEILING FANS”, the bottom of the motor housing of a conventional ceiling fan is provided with a column located at five certain locations around its circumference respectively, and a fixing hole bored at two sides of the column respectively. The column is also provided with a female-threaded hole. The blade bracket is provided with a through hole and positioning pins corresponding to the female-threaded hole and the fixing holes respectively. So, the motor housing can be primarily fixed by a locking element and a screw inserted through each of the columns, and next the positioning pins of the blade bracket are put in the fixing holes of the motor housing. Then, lock a guiding slope of the locking element in the through hole of the blade bracket to keep the blade bracket completely installed under the motor housing.

In assembly, the motor is first installed below the ceiling and next, each of the locking elements is loosely fixed in the female-threaded hole of the column by a single screw so that it is somewhat adjustable. Then, keep the through hole of each of the blade brackets locked by the guiding slope of the locking element, and move the two positioning pins to face the fixing holes and get fixed therein. Finally, the screw in the female-threaded hole can be further screwed up totally. Although the locking element can get the purpose of quickly locking the blade bracket, but it needs the positioning pins and the fixing hole to obtain a stable installation, not only having too many components, but also increasing cost.

SUMMARY OF THE INVENTION

The objective of this invention is to offer a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan.

The motor housing has its bottom provided with at least a positioning plate respectively projected downward at plural locations equidistantly spaced apart around its circumference. Each of the positioning plates has a long side arranged around the circumference of the motor housing. Each blade bracket is provided with a connecting portion for connecting with the motor housing. The connecting portion is provided with at least a plugging groove bored vertically for corresponding to the positioning plate. In installation, the blade bracket can be moved upward to keep the plugging groove instantly inserted by the positioning plate as the plugging groove and the positioning plate are correspondingly arranged around the circumference of the motor housing. And, engaging positioning locations of the blade brackets and the motor housing are simultaneously located at right positions for being fixed by screwing elements without necessity of adjusting position.

BRIEF DESCRIPTION OF DRAWINGS

This invention is better understood by referring to the accompanying drawings, wherein:

FIG. 1 is an exploded perspective view of a preferred embodiment of a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention;

FIG. 2 is a perspective view of the preferred embodiment of a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention; and

FIG. 3 is a side cross-sectional view of the first preferred embodiment of a fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIGS. 1˜3 show a preferred embodiment of a fast-positioning device for assembling blade brackets 20 to a motor housing 10 of a ceiling fan. The ceiling fan at least includes a motor housing 10 and plural blade brackets 20.

The motor housing 10 has a round bottom, made of metal and provided with a positioning plate 11 located at five certain locations around it s circumference respectively, closer to its center, and equidistantly spaced apart. The positioning plate 11 is integrally formed by pressing down from the bottom of the motor housing 10, shaped rectangular and provided with a long side 111 and a short side 112. The long side 111 of the positioning plates 11 is arranged around the circumference of the motor housing 10 in order. The motor housing 10 is also provided with a threaded hole 12 bored at two sides of each of the positioning plates 11 respectively.

Each blade bracket 20 is provided with a connecting portion 21, which is to be connected with the motor housing 10, provided with a plugging groove 211 bored vertically at its center for corresponding to the positioning plate 11. The plugging groove 211 formed rectangular is to be vertically inserted and restricted by the positioning plate 11, having its wall attached with the short sides 112 of the positioning plate 11 and its bottom attached with the long side of the positioning plate 11. Additionally, the connecting portion 21 is also provided with a through hole 212 bored at its two sides respectively, corresponding to the threaded hole 12 so as to let a screw 22 to pass through and be engaged with the threaded hole 1 2. Therefore, the blade brackets 20 are stably installed under the motor shell.

As shown in FIGS. 1˜3, in assembling, the motor housing 10 is first fixed under the ceiling and then, each of the blade brackets 20 is vertically moved up to keep the plugging groove 211 inserted by the positioning plate 11. By the time, the through holes 212 of the blade bracket 20 are positioned to exactly face to the threaded holes 12 of the motor housing 10, ready for the screws 22 to pass through and be screwed up in the threaded holes 12. It is to be noted that as the plugging grooves 211 and the long sides 111 of the positioning plates 11 are correspondingly formed along the circumference of the motor housing 10, the blade brackets 20 can be instantly positioned under the motor housing 10 and the related positioning holes 12 and 212 are simultaneously located just in the same positions for being fixed by the screws 22.

The advantages of the invention are described below as can be seen from the foresaid description.

In installation, as the plugging grooves 211 and the long sides 111 of the positioning plates 11 are correspondingly formed around the circumference of the motor housing 10, the blade brackets 20 can be instantly positioned under the motor housing 10, and the through holes 212 and the threaded holes 12 are simultaneously located at the same position for being fixed by the screws 22 without necessity of further adjustment. And, each of the positioning plates 11 is formed integrally by pressing the bottom of the motor housing 10, able to advance manufacturing efficiency and lower cost.

While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention. 

1. A fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan, said motor housing having its bottom assembled with plural said blade brackets spaced apart equidistantly around its circumference, said blade brackets fixed with said motor housing by screws passing through corresponding through holes, said fast-positioning device characterized by: said motor housing provided with a positioning plate respectively located at plural locations around its circumference, that are closer to its center and equidistantly spaced apart, each of said positioning plates extended downward from the bottom of said motor housing and arranged around the circumference of said motor housing; and said blade bracket provided with a connecting portion for connecting with said motor housing, said connecting portion at least provided with a plugging groove bored vertically for corresponding to said positioning plate of said motor housing, said plugging groove to be vertically inserted by said positioning plate to keep said blade bracket quickly positioned on said motor housing and engaging positioning locations of said blade brackets and said motor housing exactly facing to each other. 2 The fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan as claimed in claim 1, wherein said motor housing has a round bottom, made of metal and provided with a positioning plate located at five certain locations around its circumference respectively and equidistantly spaced apart, each said positioning plate integrally formed by pressing down from the bottom of said motor housing to have a rectangular shape, each said positioning plate provided with a long side and a short side, said long side of said positioning plates arranged regularly around the circumference of said motor housing, said connecting portion of said blade bracket provided with a plugging groove bored at its center for being inserted by said positioning plate. 3 The fast-positioning device for assembling blade brackets to a motor housing of a ceiling fan as claimed in claim 1, wherein said motor housing is provided with a threaded hole bored at two sides of each said positioning plate respectively and said connecting portion of each said blade bracket is provided with a through hole bored at its two sides respectively for corresponding to said threaded hole, so that screws are inserted through said through holes to be fixed in said threaded holes to keep said blade brackets combined stably with and under said motor housing. 